期刊
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
卷 13, 期 3, 页码 74-78出版社
SPRINGER
DOI: 10.1016/S1006-706X(06)60065-4
关键词
laser power; cermet coating; microstructure; wear resistance
Laser cladding nickel-based alloy coating (Ni60) and nickel-based composite coating doped with WC particles by 35% (WCp/Ni) were produced on the low-carbon steel substrate by CO, continuous wave laser with power of 5 kW using the injected powder. technique. The effect of laser power on microstructure and wear resistance of laser cladding WCp/Ni cermet coating was investigated. The WCp/Ni alloy coating with evenly distributed WC ceramic phases and the better bond with the substrate alloy was obtained at a power of 2.2 M Diffusion solution reaction happened between WC particles and the substrate alloy during laser cladding, and led to the formation of block rich-tungsten carbide on the edges of the WC particles, especially at higher power. The WCp/Ni alloy coating consists of the undissolved WC particles, the block or dendritic rich-tungsten carbide, the bar-like rich-chromium carbide, and dendrite solid solution and eutectic structure among the carbides. Microhardness and wear resistance of the WCp/Ni coating at different powers were much higher or better than those of Ni60 alloy coating, and the best results were obtained at power of 2.2 kW.
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